A 4 1 4-pole, 3-phase, 50 Hz, slip-ring induction motor hort-circuited. The rotor resistance is 0.1 Ophase xternal resistance of 0.1 /phase is added to the peed?

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Q20/
A 4-pole, 3-phase, 50 Hz, slip-ring induction motor rotates at 1440 r.p.m. With slip-ring terminals
short-circuited. The rotor resistance is 0.1 2/phase and standstill reactance/phase is 0.6 2. If an
external resistance of 0.1 2/phase is added to the rotor circuit, what will be the new full-load
speed?
Ans[ 1380 r.p.m.]
Transcribed Image Text:Ans[ 0.372] Q20/ A 4-pole, 3-phase, 50 Hz, slip-ring induction motor rotates at 1440 r.p.m. With slip-ring terminals short-circuited. The rotor resistance is 0.1 2/phase and standstill reactance/phase is 0.6 2. If an external resistance of 0.1 2/phase is added to the rotor circuit, what will be the new full-load speed? Ans[ 1380 r.p.m.]
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